Cascaded converter boosts LED-drive capability

by Grant Smith, National Semiconductor, Phoenix, AZ; Edited by Charles H Small and Fran Granville, EDN, Aug 16 2007

Focus:
A two-stage boost converter achieves the boost ratio needed to power up to 30 white LEDs from 3 alkaline cells. This approach offers a simpler solution than designs based on an integrated flyback regulator.

What you’ll learn:

• How to power 20 to 30 white or ultraviolet LEDs from three alkaline cells
• How to build a two-stage cascaded boost converter

Notes:
An EDN Design Idea

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